JP2008008527A - Operation method of absorption type water cooler and operation system of absorption type water cooler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation method and an operation system of an absorption type water cooler capable of efficiently operating the absorption type water cooler while reducing generation of an exhaust gas. <P>SOLUTION: This operation system of the absorption type water cooler comprises the absorption type water cooler 10 capable of producing cooled water by utilizing water 11 (hot water) to which the heat is supplied from the external, a heat storage type heat supply device 20 capable of supplying the stored heat to the external through oil 23, and a heat exchanger 30 exchanging heat between the oil 23 and the water 11. Further it comprises supply control means 25, 26 controlling the supply of the oil 23 from the heat storage type heat supply device 20 to the heat exchanger 30, so that the oil 23 is supplied from the heat storage type heat supply device 20 to the heat exchanger 30 in starting by switching the absorption type water cooler 10 from a stop state to an operation state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an operation method of an absorption chiller capable of supplying cold water and hot water using hot water and an operation system of the absorption chiller.

  2. Description of the Related Art Conventionally, an absorption chiller operating system for driving an absorption chiller using warm water heated by exhaust heat from a cogeneration device or the like for heating a regenerator has been used. In this system, first, in a cogeneration apparatus, electric power is supplied to the outside by a generator, and hot water is obtained by recovering exhaust heat generated from the generator. In the absorption chiller, it is possible to heat and cool the regenerator by using this hot water. For example, Patent Document 1 describes an absorption chiller that heats hot water using the heat of exhaust gas discharged from a micro gas turbine and heats the regenerator using the heated hot water. Yes. This absorption chiller is equipped with a burner for supplementarily heating hot water and a blower for supplying air to the burner. When the temperature of hot water heated by the exhaust gas exceeds a predetermined temperature, the burner It is possible to lower the temperature of the hot water by exchanging heat between the air and the hot water by blowing air using a blower in a state where the combustion of is stopped. In view of the difficulty of adjusting the hot water temperature in the heat exchange portion between the exhaust gas and hot water, the use of a blower used for auxiliary heating is economical without increasing the number of components.

JP 2001-1224011 A

However, in the case of an absorption chiller that uses hot water heated by exhaust heat from a cogeneration device as described in Patent Document 1, the hot water is heated when a generator such as a gas turbine is stopped. It is impossible to use air conditioning. In addition, it is conceivable to restart the generator, but restarting the generator when electric power is unnecessary can not effectively use the generated power, resulting in a large energy loss and from the viewpoint of energy saving. It is not preferable. It is also possible to heat the hot water using an auxiliary heater (such as a burner) and use it in an absorption water heater, but in this case, the combustion gas generated by burning fuel such as kerosene and gas Heat exchange with water will be performed. Therefore, heat loss to the exhaust gas side is large, and CO ₂ gas is generated unnecessarily, resulting in a large environmental load.
In particular, when the absorption chiller is started from a stopped state, the temperature of the hot water used in the absorption chiller is low, so the predetermined temperature required for operating the absorption chiller stably with hot water. The amount of heat required to heat up to a large value is problematic because the influence of heat loss by an auxiliary heater or the like becomes large.

  In view of the above circumstances, the present invention provides an absorption chiller operation method and an absorption chiller operation system capable of efficiently operating an absorption chiller by suppressing the generation of exhaust gas. For the purpose.

Means and effects for solving the problems

  The present invention relates to an operation method of an absorption chiller using a heat storage heat supply device and an operation system of an absorption chiller. And the operation method of the absorption chiller according to the present invention and the operation system of the absorption chiller have the following features in order to achieve the above object. That is, the operation method of the absorption chiller of the present invention includes the following features alone or in combination as appropriate.

  In order to achieve the above object, the first feature of the operation method of the absorption chiller according to the present invention is that the cooling water is generated using the heat of the liquid first heat exchange medium supplied with heat from the outside. The absorption chiller operation method is capable of supplying the stored heat to the outside through the liquid second heat exchange medium when the absorption chiller is turned on from the stop state to the operation state. Heat is supplied to the first heat exchange medium using a regenerative heat supply device capable of performing the above operation.

  The first feature of the operation system of the absorption chiller according to the present invention for achieving the above object is that the cooling water is generated by utilizing the heat of the liquid first heat exchange medium supplied with heat from the outside. An absorption chiller that can be supplied, a heat storage heat supply device that can supply stored heat to the outside via the liquid second heat exchange medium, and the heat storage heat supply device. A heat exchanger for exchanging heat between the second heat exchange medium and the first heat exchange medium supplied to the absorption chiller, and between the absorption chiller and the heat exchanger Second heat medium circulation for circulating the second heat exchange medium between the first heat medium circulation passage for circulating the first heat exchange medium, and the heat storage heat supply device and the heat exchanger. Control of the flow path and the supply of the second heat exchange medium from the heat storage heat supply device to the heat exchanger Supply control means, and the supply control means transfers the second heat exchange medium from the heat storage heat supply device to the heat exchanger when the absorption chiller is switched from a stopped state to an operating state. It is to control to supply.

According to these configurations, when the absorption chiller is started up, the liquid first heat exchange medium used in the absorption chiller is the same as the liquid second heat exchange medium supplied from the heat storage heat supply device. It is heated by exchanging heat between them. When heat is exchanged between liquids via a heat exchanger, exhaust gas is not generated unlike when fuel is burned and heated, so heat is released into the atmosphere as exhaust gas. There is no heat loss, and the first heat exchange medium can be efficiently heated.
In addition, heat is stored in the regenerative heat supply device using exhaust heat generated at a time different from the time when the absorption chiller operates or exhaust heat generated at a remote location, and the stored heat is used. Therefore, it is not necessary to newly burn fuel when the absorption chiller is started up, and the generation of CO ₂ can be suppressed.
In particular, when the absorption chiller is started up, the first heat exchange medium that has been cooled to a temperature close to the ambient temperature must be significantly increased to a predetermined temperature required for the operation of the absorption chiller. However, by supplying heat from the regenerative heat supply device, heat can be efficiently supplied to the first heat exchange medium as described above, and the heat loss in the operation of the absorption chiller can be significantly reduced. It is effective because it can.

  A second feature of the operation method of the absorption chiller according to the present invention is the operation method of the absorption chiller having the first feature, wherein the regenerative heat supply device is changed by a state change between a solid and a liquid. A heat storage body that stores heat and heat exchange by directly contacting the heat storage body, the second heat exchange medium that has a smaller specific gravity than the heat storage body and does not react with the heat storage body, are housed in an internal space, and Taking the second heat exchange medium below the internal space and discharging the second heat exchange medium from above the internal space.

  The second feature of the absorption chiller operation system according to the present invention is the absorption chiller operation system having the first feature, wherein the heat storage heat supply device is in a state of a solid and a liquid. A heat storage body that stores heat by change and heat exchange by directly contacting the heat storage body, and the second heat exchange medium that has a smaller specific gravity than the heat storage body and does not react with the heat storage body, are housed in an internal space, The second heat exchange medium heat-exchanged with the first heat exchange medium by the heat exchanger is taken into the lower part of the internal space, and the second heat exchange medium is discharged from the upper part of the internal space to exchange the heat. Is to supply to the vessel.

According to these structures, the 2nd heat exchange medium taken in the downward direction of the internal space of a heat storage type heat supply apparatus moves heat through a heat storage body, and performs heat exchange between heat storage bodies. As a result, the heat storage body and the second heat exchange medium are in direct contact with each other to exchange heat, so that the heat exchange efficiency between the heat storage body and the second heat exchange medium can be improved. Therefore, the stored heat can be efficiently used for the operation when the absorption chiller is started up.
Further, since the temperature of the heat storage body is maintained at the melting point temperature of the heat storage body in the transition stage from the liquid to the solid of the heat storage body, the temperature of the second heat exchange medium supplied to the heat exchanger from the heat storage heat supply device Can also be kept substantially constant. Therefore, it is possible to easily control the amount of heat transferred to the first heat exchange medium via the heat exchanger.

  Hereinafter, the best mode for carrying out the absorption type according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view showing an operation system of an absorption chiller for implementing the operation method of the absorption chiller according to the present invention. The operation system 100 of the absorption chiller of this embodiment stores heat in the absorption chiller 10 and the erythritol 22 (heat storage body) accommodated in the heat storage tank 21, and the oil 23 (second heat exchange medium) is stored. A heat storage type heat supply device 20 capable of supplying heat to the outside as a heat medium, oil 23 supplied from the heat storage type heat supply device 20, and water 11 (first heat exchange medium) used in the absorption chiller 10 And a heat exchanger 30 for performing heat exchange with the heat exchanger. Moreover, it is comprised so that the water 11 can circulate through the 1st circulation pipe line 61 (1st heat-medium circulation flow path) between the absorption-type cold water machine 10 and the heat exchanger 30, and a heat storage type heat supply is provided. Between the apparatus 20 and the heat exchanger 30, it is comprised so that the oil 23 can circulate through the 2nd circulation conduit 62 (2nd heat-medium circulation flow path).

  The absorption chiller 10 includes a regenerator, a condenser, an evaporator, an absorber, and the like (not shown), and can generate cooling water using hot water at a predetermined temperature and supply it to the indoor unit 40. In addition, the absorption chiller 10 includes an auxiliary boiler 50, and the water 11 can be appropriately heated by burning the auxiliary fuel.

  In the absorption chiller 10, water (not shown), which is a refrigerant circulating inside the device of the absorption chiller 10, is evaporated in a depressurized evaporator to take away heat of vaporization. The circulating water 42 in the pipeline 41 circulating between the machine 40 is cooled to generate cooling water. The circulating water 42 cooled in the absorption chiller 10 is supplied to the indoor unit 40 through the pipe 41, and the room is cooled. The water evaporated in the evaporator is transported to the absorber and absorbed by an absorbing solution that easily absorbs moisture, such as a lithium bromide solution. The absorption liquid diluted by absorbing water is heated by the heat of the high-temperature water 11 supplied from the heat exchanger 30 through the circulation line 61 in the regenerator, whereby the absorbed water evaporates. And concentrated. The water evaporated in the regenerator is cooled in the condenser, returned to liquid water, transported to the evaporator, and used again for cooling the circulating water 42.

  In addition, the absorption chiller 10 is not limited to a hot-water absorption chiller that generates hot water using hot water, but can absorb not only cooling water but also high-temperature hot water and supply it to the outside. It is good also as a type cold / hot water machine.

  The heat storage type heat supply device 20 is a heat storage device of a type that exchanges heat by direct contact between the oil 23 and the erythritol 22 that is a heat storage body, and includes a heat storage tank 21, a heater 24, and a flow rate control unit 25 (supply control means). ) And a valve opening degree adjusting unit 26 (supply control means).

  The heat storage tank 21 has an internal space, and a heat insulating material or the like made of a foamed resin having heat resistance is attached to the outer peripheral portion. The oil 23 and erythritol 22 are accommodated in the internal space of the heat storage tank 21. Specifically, the heat storage tank 21 is provided with a separation plate 21a that separates the internal space into two spaces. The separation plate 21a is a flat plate and is provided with a plurality of holes through which the oil 23 can pass. The separation plate 21a is formed from a member having high thermal conductivity. Oil 23 and erythritol 22 are accommodated in the upper side (hereinafter referred to as “upper space”) of the internal space vertically separated by the separation plate 21a, and the lower side of the separated internal space (hereinafter referred to as “the upper space”). Only the oil 23 is accommodated in the “lower space”. In this embodiment, erythritol 22 capable of efficiently storing heat in a short time is used as the heat storage body, but sodium acetate trihydrate or the like may be used.

  The oil 23 is supplied with exhaust heat generated in a factory or the like, and exchanges heat with the erythritol 22 by direct contact with the erythritol 22 to store the exhaust heat in the erythritol 22 or is stored in the erythritol 22. It is a heat medium for taking out the heat and supplying heat to the water 11 used in the absorption chiller 10 in the heat exchanger 30.

  The erythritol 22 is brought into direct contact with the oil 23 heated to a high temperature, for example, by exhaust heat generated outside, so that the temperature rises in a solid state and stores the heat of the oil 23 as sensible heat. It is possible to store heat as latent heat by changing the state from solid to liquid. Even in the liquid state, when heat is further supplied, the temperature rises and heat can be stored as sensible heat.

  Specifically, the melting point of erythritol 22 is about 119 degrees, and it is a solid at normal times (room temperature). When the heat of the oil 23 is conducted by direct contact with the oil 23 having a temperature higher than that of the erythritol 22 supplied with heat, the temperature of the erythritol 22 rises, and when it reaches the melting point, the state changes from solid to liquid. To store heat in a liquid state.

  Further, when the erythritol 22 is storing heat, that is, when the erythritol 22 is in a liquid state, the heat stored in the erythritol 22 is directly brought into contact with the oil 23 having a temperature lower than that of the erythritol 22, thereby transferring the stored heat to the oil 23. Decreases and changes state from liquid to solid.

  The oil 23 has a specific gravity smaller than that of the erythritol 22 and hardly causes a chemical reaction with the erythritol 22, so that the oil 23 is not mixed with the erythritol 22. Thus, the oil 23 and the erythritol 22 accommodated in the upper space are separated from each other with the oil 23 in the upper layer and the erythritol 22 in the lower layer without interposing a member or the like therebetween. The lower space is filled with oil 23, and the oil 23 is discharged from the heater 24, which will be described later, to the lower space, so that the oil 23 passes through the hole of the separation plate 21a and moves upward. To do. At this time, the pressure in the lower space becomes higher than the pressure in the upper space where the erythritol 22 exists, so that even if the erythritol 22 in the upper space is liquid, it does not move to the lower space through the hole of the separation plate 21a. It has become.

  The heater 24 is provided integrally with the heat storage tank 21, supplies exhaust heat generated from a factory or the like to the oil 23, stops heat supply, and places the oil 23 below the internal space of the heat storage tank 21. Discharge. The heater 24 has, for example, a heat transfer pipe disposed so as to surround a pipe through which the oil 23 circulates. By supplying the exhaust heat to the heat transfer pipe, the heater 24 is supplied to the oil 23 via a pipe wall. Heat can be supplied (heated). When heat is stored in the erythritol 22, heat is supplied to the oil 23, and the supplied oil 23 is discharged to the lower space. Further, when the erythritol 22 is cooled, that is, when heat is supplied from the erythritol 22 to the oil 23, the oil 23 taken in through the heater 24 in a state where the heating is stopped is discharged to the lower space as it is.

  The heater 24 protrudes from the upper part of the heat storage tank 21 toward the internal space, and is disposed so as to cross the boundary surface between the oil 23 and erythritol 22 in the upper space substantially perpendicularly. By integrating the heater 24 and the heat storage tank 21 so that a part of the heater 24 is provided in the internal space of the heat storage tank 21, space saving of the heat storage heat supply device 20 can be realized. . In addition, when heat is supplied to the oil 23 with the heater 24, the time and distance supplied from the heater 24 to the heat storage tank 21 can be shortened, so that the heat of the oil 23 is not taken away during supply, Heat can be stored in erythritol 22 efficiently. Furthermore, by arranging the heater 24 so as to cross the boundary surface between the oil 23 and erythritol, the heat generated from the heater 24 can be conducted to the erythritol, and the heat from the heater 24 is effectively used. Thus, heat can be stored more efficiently.

  Furthermore, the heater 24 includes a heater tube 24a and an auxiliary tube 24b formed from a member having high thermal conductivity. The heater tube 24 a is provided below the heater 24, and discharges the oil 23 taken into the heater 24 into the lower space of the heat storage tank 21. The oil 23 discharged into the lower space flows into the erythritol 22 from the hole of the separation plate 21 a and then rises to the upper oil 23. During this rise, heat exchange is performed with erythritol 22 by direct contact with erythritol 22.

  The auxiliary pipe 24 b is disposed so as to pass through the erythritol 22 in the upper space of the heat storage tank 21 and the oil 23 in the lower space, and the oil 23 of the heater 24 is passed through the oil 23 in the upper space of the heat storage tank 21. To discharge. When the oil 23 is supplied with heat by the heater 24, the heat of the oil 23 is conducted to erythritol or the oil 23 in the lower space by indirect contact through the wall of the auxiliary pipe 24b while flowing through the auxiliary pipe 24b. . Thereby, heat can be stored in the erythritol 22, and since the oil 23 in the lower space can be maintained at a high temperature, heat can be stored more efficiently.

  Further, when the erythritol 22 is cooled, that is, when the heat stored in the erythritol 22 is taken out, the erythritol 22 is solidified, so that the oil 23 that is in direct contact with the erythritol 22 hardly rises in the erythritol 22. Become. As a result, the amount of the oil 23 in the upper space decreases, and thereby the amount of discharge from the discharge pipe 62a described later also decreases. However, the provision of the auxiliary pipe 24b prevents the amount of oil 23 from decreasing. it can. A valve 24c is provided in the middle of the auxiliary pipe 24b, and the oil 23 can be circulated or stopped by opening and closing the valve 24c.

  Further, as described above, the separation plate 21a is formed of a member having a high thermal conductivity, and erythritol is indirectly discharged from the entire lower side through the separation plate 21a by discharging the oil 23 supplied with heat to the lower space. 22 can be conducted.

  The heat storage tank 21 is provided with a discharge pipe 62a for discharging the oil 23 stored in the upper space. The discharge pipe 62a is a second circulation pipe that is a pipe through which the oil 23 circulates between the regenerative heat supply device 20 and the heat exchanger 30 together with an intake pipe 62b, an extraction pipe 62c, and a supply pipe 62d described later. A path 62 is formed. Further, in the middle of the discharge pipe 62a, a flow control unit 25 (supply control means) including a pump 25a, a flow meter 25b, and a pump control device 25c is installed. By operating the pump 25a, the oil 23 flows through the discharge pipe 62a, and the flow rate of the oil 23 flowing through the discharge pipe 62a can be measured by the flow meter 25b. And the pump control apparatus 25c can control the pump 25a based on the measurement result of the flow meter 25b (specifically, control of the rotation speed of the pump) so that the flow rate of the oil 23 is always constant. It is like that.

  A connection pipe 63 and an intake pipe 62b are connected to the discharge pipe 62a. Specifically, the discharge pipe 62a, the connection pipe 63, and the intake pipe 62b are connected by the three-way valve 26a. The three-way valve 26a is a valve that can switch between two flow paths by opening and closing. The three-way valve 26a is connected to the flow rate of the oil 23 flowing from the discharge pipe 62a to the intake pipe 62b and from the discharge pipe 62a to the connection pipe 63 by a valve control device 26c of the valve opening degree adjusting unit 26 (supply control means) described later. It is possible to adjust the ratio of the flow rate of the oil 23 flowing in the tank. The intake pipe 62b is connected to the heat exchanger 30, and the oil 23 flowing through the intake pipe 62b is taken into the heat exchanger 30.

  On the other hand, the heater 24 is provided with a supply pipe 62d for taking in the oil 23. A connecting pipe 63 and an extraction pipe 62c are connected to the supply pipe 62d. Specifically, the supply pipe 62d, the connection pipe 63, and the extraction pipe 62c are connected by the three-way valve 27, respectively. The take-out pipe 62c is connected to the heat exchanger 30, heat is recovered in the heat exchanger 30, and the oil 23 discharged from the heat exchanger 30 flows. Then, by operating the three-way valve 27, the supply pipe 62d can be connected to the extraction pipe 62c so as to be able to flow, or the supply pipe 62d can be connected to the connection pipe 63 so as to be able to flow. The connecting portion of the supply pipe 62d, the connection pipe 63, and the take-out pipe 62c may be a three-way valve that prevents backflow of the oil 23 instead of the valve. In this case, it is not necessary to operate and switch the flow path as in the case of the three-way valve.

  As described above, the second circulation pipe 62 (discharge pipe 62a, intake pipe 62b, take-out pipe 62c and supply pipe 62d) and the connection pipe 63 are disposed, so that the discharge pipe 62a, the connection pipe 63 and the supply are supplied. Two flow paths are formed: a flow path composed of the pipe 62d (hereinafter referred to as the first flow path) and a flow path composed of the second circulation conduit 62 (hereinafter referred to as the second flow path). Thus, even when the flow rate of the oil 23 flowing through the discharge pipe 62a is kept constant by the flow rate control unit 25, the first flow path and the second flow path are switched by opening and closing the three-way valve 26a. It is possible to control the flow rate of the oil 23 supplied to the heat exchanger 30 from the regenerative heat supply device 20. The three-way valve 27 may be operated in synchronization with the three-way valve 26a to switch the flow path, or may be operated independently.

  The flow control unit 25 includes a pump 25a, a flow meter 25b, and a pump control device 25c. As described above, the pump 25a and the flow meter 25b are provided in the middle of the discharge pipe 62a. The pump 25a is a device for circulating the oil 23, and the flow meter 25b is a device for measuring the volume or mass of the fluid flowing through the cross section per unit time of the oil 23 flowing through the discharge pipe 62a. The pump control device 25c is connected to the pump 25a and the flow meter 25b, and controls the pump 25a based on the measurement result of the flow meter 25b so that the value of the flow meter 25b is always constant.

  Specifically, as described above, when the erythritol 22 of the heat storage tank 21 is cooled, the state changes from liquid to solid. If it does so, the oil 23 in the lower space of the thermal storage tank 21 will pass the hole of the separation plate 21a, and will become difficult to move to upper space. As a result, the amount of the oil 23 in the upper space decreases, and the flow rate of the oil 23 discharged from the discharge pipe 62a also decreases. Thereby, the flow volume of the oil 23 which distribute | circulates the discharge pipe 62a falls, and it becomes impossible to supply sufficient oil 23 to the heat exchanger 30. For this reason, when the flow rate is decreased, the rotational speed (driving force) of the pump 25a is increased to increase the flow rate. When the flow rate is increased, the rotational speed of the pump 25a is decreased to decrease the flow rate. The flow rate of the oil 23 flowing through the discharge pipe 62a is controlled so as to be always constant. Thereby, the heat exchanger 30 can always take in the constant oil 23.

  In the present embodiment, the flow meter 25b is used to make the flow rate constant, but the flow rate is derived by measuring the flow pressure of the oil 23 flowing through other measuring instruments, for example, the discharge pipe 62a. However, the pump 25a may be controlled so that the fluid pressure is always constant.

  The valve opening adjustment unit 26 includes a three-way valve 26a, a thermometer 26b, and a valve control device 26c. As described above, the three-way valve 26a is a valve that connects the discharge pipe 62a, the connection pipe 63, and the intake pipe 62b. The thermometer 26 b is arranged in the middle of the first circulation pipe 61 that guides the water 11 from the heat exchanger 30 to the absorption chiller 10, and measures the temperature of the water 11 supplied with heat through the heat exchanger 30. . The valve control device 26c controls the opening degree of the three-way valve 26a based on the temperature of the water 11 measured by the thermometer 26b, and adjusts the ratio of the flow rate of the oil 23 flowing through the first flow path and the second flow path. To do.

  The heat exchanger 30 takes in the high-temperature oil 23 supplied with the heat stored in the erythritol 22, and takes in the water 11 to be used in the absorption chiller 10, and indirectly between the taken-in oil 23 and the water 11. The heat of the oil 23 can be transmitted to the water 11 by the contact, and the temperature of the water 11 can be raised.

Next, the operation method of the absorption chiller 10 will be described.
FIG. 2 shows the operation time from the start of the absorption chiller 10, the temperature of the hot water (water 11) supplied to the absorption chiller 10, and the cooling water (circulation water) supplied from the absorption chiller 10 to the indoor unit 40. 42) shows the relationship with the temperature.

  At the time of starting up the absorption chiller 10 from the stopped state to the operating state (time zone indicated by A in FIG. 2), the heat storage type is performed until the temperature of the water 11 reaches a predetermined temperature with the auxiliary boiler 50 stopped. Control is performed so that the oil 23 is supplied from the heat supply device 20 to the heat exchanger 30. In the present embodiment, the valve control device 26c automatically adjusts the three-way valve 26a so that the flow path to the connection pipe 63 is blocked and the flow path to the intake pipe 62b is fully opened. Thereby, the flow rate of the oil 23 supplied to the heat exchanger 30 is increased, and the temperature of the water 11 can be raised in a short time. Here, the predetermined temperature is desirably a temperature of 70 ° C. or higher and 100 ° C. or lower. By setting the temperature of the water 11 that is a medium for heating the regenerator to 70 ° C. or higher, it is possible to efficiently evaporate the water in the regenerator, and when the water 11 exceeds 100 ° C., the water 11 evaporates. This is because the absorption chiller 10 cannot be used.

  In the present embodiment, the predetermined temperature, which is a target temperature for heating the water 11 (hot water), is set to 90 ° C., and is cooled by the absorption chiller 10 as shown in FIG. The temperature of the circulating water 42 to be supplied decreases as the temperature of the water 11 increases, and when the temperature of the water 11 reaches a predetermined temperature of 90 ° C., the temperature is cooled to about 5 ° C.

  After the temperature of the hot water reaches a predetermined temperature by heat exchange with the oil 23 from the heat storage heat supply device 20 (time zone indicated by B in FIG. 2), the valve control device 26c is based on the measurement result of the thermometer 26b. Then, the temperature of the water 11 is maintained at a predetermined temperature of 90 ° C. by appropriately adjusting the opening degree of the three-way valve 26a. Specifically, when the temperature of the water 11 discharged from the heat exchanger 30 is high, the opening degree of the three-way valve 26a is adjusted so that the oil 23 also flows through the connection pipe 63 (first flow path). Thus, the flow rate of the oil 23 taken in by the heat exchanger 30 can be reduced, whereby the amount of heat transferred to the water 11 in the heat exchanger 30 can be reduced, the temperature of the water 11 is reduced, and Can be close to temperature. Further, when the temperature of the water 11 measured by the thermometer 26b is low, by adjusting the opening of the three-way valve 26a so as to reduce the flow rate of the oil 23 flowing through the connection pipe 63 (first flow path), The flow rate of the oil 23 taken in by the heat exchanger 30 can be increased, whereby the amount of heat transferred to the water 11 in the heat exchanger 30 can be increased, and the temperature of the water 11 is increased to a predetermined temperature. You can get closer.

The control of the three-way valve 26a can be simple ON-OFF control. That is, the three-way valve 26a switches between switching between the case where the intake pipe 62b is shut off and the oil 23 is allowed to flow only through the connection pipe 63, and the case where the connection pipe 63 is shut off and the oil 23 is allowed to flow only through the intake pipe 62b. The structure which controls the flow volume of the oil 23 supplied to the exchanger 30 may be sufficient.
In this case, the valve control device 26c determines whether or not the water 11 is heated to a predetermined temperature based on the measurement result of the thermometer 26b. If the temperature of the water 11 is lower than the predetermined temperature, the valve control device 26c takes The three-way valve 26a is switched so that the oil 23 flows through the intake pipe 62b (ON state). When the temperature of the water 11 is higher than a predetermined temperature, the supply of the oil 23 to the intake pipe 62b is blocked. The three-way valve 26a is switched (OFF state). Thereby, the flow rate of the oil 23 supplied to the heat exchanger 30 can be controlled by a simple control mechanism, and the heat supply necessary for the absorption chiller 10 can be easily performed.

  Thus, by controlling the three-way valve 26a based on the measurement result of the thermometer 26b, the amount of heat supplied to the water 11 used in the absorption chiller 10 can be optimally adjusted, and the temperature of the water 11 can be adjusted. Since it can be controlled, an extra heat supply can be eliminated and the absorption chiller 10 can be operated efficiently. Further, the flow rate of the oil 23 supplied to the heat exchanger 30 is adjusted by controlling the pump 25a by the pump control device 25c based on the measurement result of the thermometer 26b, not limited to the case of controlling the three-way valve 26a. A configuration is also possible.

  In addition, after the water 11 reaches a predetermined temperature, the heat supply from the heat storage type heat supply device 20 is stopped, and the water 11 is appropriately heated by the auxiliary boiler 50 and kept at the predetermined temperature to continue the absorption chiller 10. It is also possible to drive. It is also possible to supply heat to the water 11 by using the heat storage type heat supply device 20 and the auxiliary boiler 50 in combination.

In addition, a thermometer is installed in the pipeline 41 so as to measure the temperature of the cooled circulating water 42 supplied from the absorption chiller 10 to the indoor unit 40, and the regenerative heat is based on the measurement result of the thermometer. The supply amount of the oil 23 from the supply device 20 to the heat exchanger 30 may be controlled.
In this case, based on the measurement result of the thermometer, when the temperature of the circulating water 42 is higher than a predetermined cooling temperature obtained by the indoor unit 40 (not sufficiently cooled), the water is supplied to the absorption chiller 10. To control the temperature of the water 11 to be increased. Specifically, by adjusting the opening of the three-way valve 26a so that the oil 23 does not flow into the first flow path, the flow rate of the oil 23 taken in by the heat exchanger 30 is increased and transmitted to the hot water. Increase the amount of heat As a result, the temperature of the water 11 rises and the absorption chiller 10 can be sufficiently cooled. Further, when the temperature of the circulating water 42 is lower than the predetermined cooling temperature (is sufficiently cooled), the opening degree of the three-way valve 26a is adjusted so that the oil 23 also flows through the first flow path. Thus, the flow rate of the oil 23 taken in by the heat exchanger 30 is reduced, and the amount of heat transmitted to the hot water in the heat exchanger 30 is reduced. Thus, excessive heat supply to the water 11 can be reduced, and the absorption chiller 10 can be operated more efficiently.

  As described above, the heat of the high-temperature oil 23 supplied from the regenerative heat supply device 20 is supplied to the water 11 through the heat exchanger 30 when the absorption chiller 10 is started up from the stopped state to the operating state. The water 11 can be heated without generating exhaust gas by performing the process of heating the water 11 to a predetermined temperature necessary for generating the cooling water with the absorption chiller 10. Therefore, it is possible to perform heat exchange between the liquid and the liquid with little heat loss due to heat released into the atmosphere as exhaust gas, and the water 11 can be efficiently heated.

Moreover, since the heat can be stored in the regenerative heat supply device 20 using the exhaust heat generated in different time zones or the exhaust heat generated in a remote place, the stored heat can be used. It becomes unnecessary to burn the fuel during the start-up operation of the machine 10, and it is possible to suppress the generation of new CO ₂ .

  In particular, when the absorption chiller 10 is started up, the temperature of the water 11 is close to room temperature, so it is necessary to raise the temperature to a predetermined temperature required for the operation of the absorption chiller 10. By supplying heat to the water 11 well, heat loss in the operation of the absorption chiller 10 can be significantly reduced, which is effective.

  In addition, after the start-up operation is finished, the valve opening degree adjustment unit 26 controls the flow rate of the oil 23 supplied from the heat storage type heat supply device 20 to the heat exchanger 30 so that the temperature of the water 11 is maintained at a predetermined temperature. Therefore, the absorption chiller 10 can be continuously operated using the heat stored in the heat storage type heat supply device 20. Is possible.

  In the present embodiment, the heat storage type heat supply device 20 exchanges heat by directly contacting the erythritol 22 that stores heat by changing the state of the solid and the liquid, and the erythritol has a specific gravity smaller than that of the erythritol 22. Oil 23 which does not react with 22 is accommodated in the internal space. And the oil 23 heat-exchanged with the water 11 in the heat exchanger 30 is taken in under the internal space of the heat storage tank 21 in which the erythritol 22 in the state of heat storage is accommodated, and the oil 23 is discharged from above the internal space. Supply to heat exchanger 30. Thereby, since the erythritol 22 and the oil 23 are in direct contact and exchange heat, the heat exchange efficiency between the erythritol 22 and the oil 23 can be improved. Therefore, the heat stored in the heat storage type heat supply device 20 can be efficiently used for the operation when the absorption chiller 10 is started up.

  Further, since the temperature of the erythritol 22 is maintained at the melting point temperature (about 119 ° C.) in the transition stage of the erythritol 22 from the liquid to the solid, the oil 23 supplied to the heat exchanger 30 from the regenerative heat supply device 20 is maintained. The temperature can also be kept substantially constant. Therefore, the amount of heat transmitted to the water 11 via the heat exchanger 30 can be easily controlled.

  In addition, after the absorption chiller 10 is in a steady operation state (a state where the hot water temperature has reached a predetermined temperature, a state indicated by B in FIG. 2), the oil 23 having a temperature exceeding 100 ° C. is heat-exchanged. When supplying to the heat exchanger 30, it is necessary to precisely control the supply flow rate of the oil 23 to the heat exchanger 30 so that the temperature of the water 11 does not boil over 100 ° C. In the initial stage (the state of the time zone indicated by A in FIG. 2), since the temperature of the water 11 is low and it is difficult to boil, precise control of the amount of heat supplied to the water 11 is unnecessary. That is, the high-temperature oil 23 supplied with heat from the high-temperature heat storage body can be used for heating the water 11 using a simple control method without precise flow rate control. Here, in the case of utilizing the sensible heat of the erythritol 22 in the liquid state, which is a state where the heat is sufficiently stored (heated to 119 ° C. or higher), the temperature of the erythritol 22 gradually decreases. It is difficult to keep the temperature of the oil 23 supplied from the type heat supply device 20 constant. However, as described above, when the absorption chiller 10 is started up, precise control of the amount of heat supplied to the water 11 is not necessarily required, so that the sensible heat can be easily used in heating the water 11. Can do. Further, by heating the water 11 with the high-temperature oil 23 when the absorption chiller 10 is started up, the temperature of the water 11 can be increased in a shorter time, and cold water can be supplied from the absorption chiller 10. Become.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

For example, the heat storage type heat supply device used in the operation method of the absorption chiller and the operation system of the absorption chiller is not limited to the one that stores heat using latent heat like the heat storage type heat supply device shown in the present embodiment. It is also possible to use a heat storage type heat supply device that stores heat using only sensible heat in a liquid state or solid state.
Moreover, it can also be set as the structure which used together the cogeneration apparatus and the thermal storage type heat supply apparatus. That is, in the time zone when the cogeneration device is operating, the hot water used in the absorption chiller is heated by the exhaust heat from the cogeneration device, and the absorption chiller is operated in the time zone when the cogeneration device is stopped. It is also possible to supply heat from the regenerative heat supply device only in cases. Moreover, it is also possible to store the exhaust heat at the time of driving the cogeneration device with a heat storage type heat supply device and use it in a time zone when the cogeneration device is stopped.

It is the schematic which shows the operation system of the absorption chiller based on embodiment of this invention. The relationship between the operation time from the start-up of the absorption chiller shown in FIG. 1, the temperature of hot water supplied from the heat exchanger to the absorption chiller, and the temperature of cooling water supplied from the absorption chiller to the indoor unit It is a graph which shows.

Explanation of symbols

10 Absorption chiller 11 Water (first heat exchange medium)
20 Heat storage type heat supply device 22 Erythritol (heat storage body)
23 oil (second heat exchange medium)
25 Flow control unit (supply control means)
26 Valve opening adjustment section (supply control means)
30 Heat Exchanger 40 Indoor Unit 42 Circulating Water 50 Auxiliary Boiler 61 First Circulation Pipeline (First Heating Medium Circulation Channel)
62 Second circulation line (second heat medium circulation line)
63 Connection pipe 100 Absorption chiller operation system

Claims (4)

An operation method of an absorption chiller capable of generating cooling water using heat of a liquid first heat exchange medium supplied with heat from outside,
Using the regenerative heat supply device capable of supplying the stored heat to the outside through the liquid second heat exchange medium when starting up the absorption chiller from the stopped state to the operating state. 1. An operation method of an absorption chiller, wherein heat is supplied to a heat exchange medium.   The heat storage type heat supply device exchanges heat by directly contacting the heat storage body with a heat storage body that stores heat by changing the state of solid and liquid, and has a specific gravity smaller than the heat storage body and does not react with the heat storage body. The second heat exchange medium is accommodated in an internal space, the second heat exchange medium is taken in the lower part of the inner space, and the second heat exchange medium is discharged from the upper part of the inner space. The operation method of the absorption chiller according to claim 1. An absorption chiller capable of generating cooling water using the heat of the liquid first heat exchange medium supplied with heat from outside;
A regenerative heat supply device capable of supplying the stored heat to the outside via the liquid second heat exchange medium;
A heat exchanger that performs heat exchange between the second heat exchange medium supplied from the heat storage heat supply device and the first heat exchange medium supplied to the absorption chiller;
A first heat medium circulation passage for circulating the first heat exchange medium between the absorption chiller and the heat exchanger;
A second heat medium circulation passage for circulating the second heat exchange medium between the heat storage type heat supply device and the heat exchanger;
Supply control means for controlling the supply of the second heat exchange medium from the heat storage heat supply device to the heat exchanger,
The supply control means controls to supply the second heat exchange medium from the heat storage type heat supply device to the heat exchanger when the absorption chiller is switched from a stopped state to an operating state. Absorption type water cooler operation system. The heat storage type heat supply device exchanges heat by directly contacting the heat storage body with a heat storage body that stores heat by a change in state between a solid and a liquid, and has a specific gravity smaller than the heat storage body and does not react with the heat storage body. A second heat exchange medium is housed in the internal space, the second heat exchange medium heat-exchanged with the first heat exchange medium by the heat exchanger is taken into the lower part of the inner space, and the upper part of the inner space is The operation system for an absorption chiller according to claim 3, wherein the second heat exchange medium is discharged from the pipe and supplied to the heat exchanger.

Images